Carbureter.



F. G. POLBERTH.

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Patented July 4, 1911.

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Application filed-Tune 13, 19109 Serial No. 688,677.

To all whom it may concern:

Be it known that I, Fnnnnnro G., Fon- BERTH, a citizen of the United States; and resident of Cleveland, county of Cuyahoga,

State of Ohio, have invented certain new a regulated.

, Another object is toprovide means whereby'a properrich mixture may be supplied to the'engine at starting.

Another 'ob ect 1s to construct the autoi matic controlling mechanism so that it will be guarded against vibrations.

,Further objects will appear from the detail description, taken in connection with the accompanying drawings, in which Figure 11s an elevation of the carbureter;

:Fig. 2 is a plan-view; Fig. 3 is a-section on Fig. 2; Fig. 4' is .a -detail view the line 3'3, showin the air intake plate; Fig. 5 shows a detail v'iew ofthefuelnozzle; and Fig. 6 shows a'detailview of th'e adjusting nut.

v The carbureter' comprises a casing forming a float chamber 10, a carburetingcha'mber 11,- and 'a;mixture pipe 12 provided with flanges which are arranged to "beconnected' to the intake manifold. The mixture pipe is: provided with the-usual butterfly throttle valve '13 and the carbureting chamber with a fuel nozzle 14' connected by channels 15 and 16 to the float chamber 10. The supply of fuel'from the float chamber is controlled by means of a. fuel needlevalve '17. The

passage 15 is formed by boring, and theend of the passage sclosed by a removableplug 18. Thecpassage 16 is provided with a rethis construction, all thepassages can be easily formed and cleaned when desired.- spider form is An air intake-plate 20 of 'tion, the nut can provided with 'holes .21, and a val ve at The carburetor casingisprovided with; -a chamber-23 below the float chambergand Specification of letters Patent. Patented 111y14,;1911

in this chamber is located an intake. valve -24 cooperating with the seat 22, and pro-x videdwith a stem 25 extending through a tube 26 in the float chamber. This tube 26' maybe-secured in place in anyflsuitable man;

ner, either by jafidriven joint or by ascrew ,joint. A sleeve 27' slides upon the tube'26 and is provided with a plunger-28 sliding in a cylinder portion 29- in the' valve casing.

This sleeve"27 is reduced indiameter so as" to form 'a shoulder 30 against which'bears one end of the spring 31, the other end'fbearingagainst the cover for the float chamber.

The end 30* of the sleeve 27 is boredandprovided with a button- 31* rounded. at both ends andarranged lower end by'means of a' button or rounded portion'32 on the' stem 25 of the. intake valve- A spring 33 1s located in a recessed portion 33 ofjthe int he plate The stem of the needle valve 17 has slidingly mounted upon itq'a ring-34which is arranged to'be adjust-ed by: means ofa nut- 35 having a threaded engagement withv the upper end of the valve stem. A locking device consisting of aspring '36 issecured-to the stem and projects outwardly therefrom as -shown at .37, so as toengage a slot 38 in the carbureter casing, so as'toprevent the valvestem from turning. The valve stem is providedwith a slot as shown more clearly in. Fig. 3, arranged to receivethe spring locking device so that the end 39 thereof may move inwardly toward the center of the-s em. The nut 35 .is provided with a plurality of recesses40 which are arranged.

to be engaged by the end 39' of thelockixkg device so as to hold the nut yieldingly in-a justed position. By'means of this construe locking device moving inwardly whenforce is appliedto rotate the nut, butthe locking engagement between the end 3,9.v and the re; cesses'40 is sufficient to holdrthis nut yield ingly in'-'locked position-. A. spring 41 is, mounted between the flange 'ofg'the" mixture pipe and the nut 35 so as the' valve'.1,'-7 closed.

Thefloat- 'chamber cover-a2 ha si'slidingl mounted npo-n it a supporter plate, 43 wine to be engaged at' the' 20 and-bears against the lower face of the valve '24.

be rotated, the spring is guidedby means of the shanks of screws -44 engaging slots'in the support or plate iThe plat'e43 is forked and 1s provided with trunnions or lugs 44*, and a lever 45 is pro- 6 'vided with coiiperating recesses 46 whichengage the lugs 44 so that the lever 45 is "pivotally mounted upon the plate 43. The right hand-rend of the lever bears upon the upper rounded surface of the button. 31". The lever is also forked so as to provide a slot $7 which engages the flattened surfaces of the valvestem, and the ring 3% is provided with trunnion lugs 48 which bear upon the upper surface of the lever. The plate 43 1 5 is provided with a forked portion 49 en gaged by one end of a lever 50 pivoted upon the cover-'42 I Therthrottle shaft 51 has mounted, upon it a lever 52 which has secured. to it a cam 29 53 arranged to engage an arm 54: on the le ve'rf45.'-" The lever 52 is provided with an adjustable stop '54. which is arranged to engage a stop 55 upon the carbureter body.

The cam 53is adjustably mounted upon the 25 lever 52 by means of screws 56 engaging a sloton the-cam. Y

' The -float,5 7 is mounted upon the sleeve 27'andengages one end of a lever 58, the other end of which engages a flange 59 on a needle valve. The stem of the needle valve hasl'mounted; upon it a spring 60 bearing against the flange and a nut 61, having a threaded'connectlon with apart 62 connected tothe-carbureter casing. The nut is ar- 3 as d to'be held in adjusted position by a yiel inglocking device 63 similar to that shown-in the needle valve, the part 62 be iing provided with a. number of recesses which -"are;yieldingly engaged by thls yielding locking device. Thev needle valve is arranged to controlthe flow of fuel from the.

mainsupply connected to a boss 64 on the carbureterf'casing'. 1 I

l The springs '31 and 4:1 are constructed and proportioned to overpower the spring 33 so [as to normally hold the intake valve and the 'fu'elvalve closed. When, however, the engine is-in'ppe'ration, the intake valve will be opened due to the suction of the engine,

andlduef tothe interconnectionof t take "andffu-el valves these valves will be .openedinthe same proportion. In'order that the proportion between these valves and therefore the quality of the mixture may ,5 be varied, the support 43 for the lever 45 is arranged to be adjusted and controlled on .the cover 42 so as to vary the ratio of the lever,arms with respect tothe fuel valve and theintake valve. Thusby' mov ng the "60 support or plate 43 to the left, the lever'arm --of the fuel valve willbe increased so that the fuel valve will now he -opened to a greater extent relatively to the air valve than :before. By meansg of.thisjconstruction, that 65 relation between the airiand fuel valves can be varied so as to control the mixture for different conditions and for various speeds. The fuel valve may be. adjusted independ en'tly by adjusting the nut 35 which is preferably provided with a knurled head.

The dash pot plunger 28 is preferably provided with apertures so as to form a liquid dash pot. This dash pot device will steady the valves against vibration caused by rapid fluctuations in the pressure, so that the movement of the valves'will at all times be steady. By placing the spring 33 below the intake valve it is insured that the valve will at all times be lifted from its seat so as to prevent. sticking due to accumulation of grease, etc.

In starting a hydrocarbon engine, it is necessary that the mixture be rich. It-is for this purpose that the cam 53 is provided 7 This cam is'provided with a slight, rise so 85 that when the throttle valve is opened, the cam will engage the arm 54: of thelever 45, so as to open the fuel valve, whereby fuel, and therefore a rich mixture will be ad mitted to the engine at starting. It is to be understood that this rise is very slight so as not to affect the automatic regulation of the fuel valveby the air'intake valve. In order to adjust this cam for different engines and for different conditions, it is adjustable on the lever as shown in Fig. 1.- The levers 52 and 50 are preferably connected to links 52 and 50 respectively which extend to the steering post of the motor vehicle, so that the operation of the carbureter The carbureter is simple in construction and cheap to manufacture. The intakevalve and itsstem can be readily removed by removing the intake plate 20, and the entire operating mechanism for the fuel valve is mounted upon a cover plate 42. The dash pot sleeve and the float can be readilyremoved by removing the-cover plate, and by mounting this sleeve upon" and the'stem within the tube or sleeve 26, a tight joint can be made between the tube 26 and the 1 1 float chamber so that allleakage will-be prevented. The construction of'this tube 26 also permits-the. cylinder 29 to be readily bored so as to cheapen the manufacture of the device.

It is obvious that various changes may be made in the details of construction without departing from this invention, and it is therefore to be understood that this invention is not. to be limited to the specific construction shown and described.

Having thus described the invention, what is claimed is? Y I 1. In a carburetor, the combination-with a casing having an air intake and a float 3;. In a carbureter, the combination with a casing having an air inlet and a mixture outlet, ofv a fuel valve, a lever upon which said valve rests, and a sliding support for said lever adapted to adjust said lever bodily with respect to said fuel valve to vary its effective lever arm. I

4:- In acarbureter, the combination with a casing having a float chamber, an air inlet and a mixture outlet, of a fuel valve, a lever upon which said valve rests, and a sliding support for said lever mounted on said float chamber and adapted to adjust said lever bddily with respect to said fuel valve to vary-its effective lever arm.

, 5. In a carbureter, the combination with a casing of a fuel valve arranged therein, a lever and a sliding support therefor, and an ad ustable sleeve on said valve resting on 1 said lever, whereby said lever may be adjust-ed, with respect to said valve to vary its effective lever arm.

6. In a carbureter, the combination With a casing having an air-valve, and a stem for said valve, of a fuel valve, a lever engaging both of said valves, and a sliding support for said lever adapted to slide said lever bodily With respect to bothv said valves to vary its lever arms with respect thereto.

7. In a carburetor, the combination with a casing having an air valve and a stem for said valve, of a fuel valve, a lever resting on said stem and supporting said fuel valve,

' and a sliding support for said valve adapted means connected to said automatically controlled valve for operating saidlever.

9. In a carbureter, the combination with a casing, of a valve therefor, a fuel valve, a lever connecting said va1ves,and a movable support for shifting said lever bodily with respect to said valves, whereby the effective length of said lever with respect to both valves can be varied.

10. In a carbureter, the combination with a casing, of a valve therefor, a fuel valve, a lever connected to said first valve, a stem for said fuel valve bearing on said lever, and a movable support for shifting said lever bodily, whereby the effective length of said lever can be varied.

11. In acarbureter, the combination with a casing having a float chamber, of air, mixture,-'and fuel valves therefor, a lever connecting said air and fuel valves whereby they are controlled in unison, and adjustable means for operating said lever from the mixture valve to open. the fuel valve'without opening the air valve.

12. In a carburetor, the combination With a casing having a float chamber,of air, mixture, and fuel valves therefor, a lever connected to said fuel valve and resting on said air valve, and an adjustable cam on said mixture valve for operating said lever to open the fuel valve Without opening said air valve.

13. In a carburetor, the combination with a casing having a float chamber and an air intake, of a valve-for said intake, a stem in said float chamber, a float on said stem, a dash pot plunger sliding on said stem and connected to said valve and a cylinder for said plunger located in said float chamber.

1a. In a carbureter, the combination with 

